one day

person who studies for the annual university entrance exams at home instead of at a 予備校 (yobikō)

one, 1 / the first in order, foremost / the beginning / the best / a kind of; one of something / (card games) an ace / unity / the bottom string of a shamisen or other Japanese musical instrument

(education) graduate student (abbr. 院生)

a private university

everything

(colloquial) current boyfriend

candied sweet potato

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

everyone, one and all